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Département de Biologie /
Pavillon Alexandre-Vachon
1045, av. de la Médecine, local 2064
Université Laval
Québec (Québec) G1V 0A6
Phone : +1 418 656 2131 ext. 404880


Chiaki Motegi

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Post-Doctoral Fellow

Phone : 418-656-2131 ext. 3198
Fax : 418-656-2339

Doctor of Science (2004-2008)
Graduate School of Science, Kyoto University, Kyoto, Japan

Master of Environmental Science (2002-2004)
Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama, Japan

Faculty of Marine Science, University of Hawaii at Hilo, Hawaii, USA (2000-2002)

B. Sc. Agriculture (1995-1999)
Tamagawa University, Tokyo, Japan

Research Interests :

  • Prokaryotic community
  • Viral community
  • Bacteria-Viral interaction
  • Biogeochemical cycle
  • Microbial food webs
  • Microbial oceanography

Professionnal Research Experience :
April 2012 to present: Postdoctoral Fellow, Takuvik Joint International Laboratory, Université Laval (Canada) - CNRS (France), Departement de Biologie and Québec Océan, Université Laval, Québec, QC, Canada

January 2012 to March 2012: Postdoctoral Fellow, Atmosphere and Ocean Research Institute, The University of Tokyo, Japan

November 2008 to December 2012: Postdoctoral fellow, Laboratoire d'Océanographie de Villefranche, CNRS, Université Pierre et Marie Curie-Paris 6, France

April 2008 to October 2008: Postdoctoral Fellow, Ocean Research Institute, The University of Tokyo, Japan


Motegi C., Kaiser K., Benner R. and Weinbauer M.G. (in press) Effect of P-limitation on prokaryotic and viral production in surface waters of the Northwestern Mediterranean Sea. J Plankton Res

Mari X., Lefèvre J., Torréton J.P., Bettarel Y., Pringault O., Rochelle-Newall E., Marchesiello P., Menkes C., Rodier M., Migon, C., Motegi C., Weinbauer M.G. and Legendre L. (2014) Effects of soot deposition on particle dynamics and microbial processes in marine surface waters. Global Biogeochem Cycles 28 doi:10.1002/2014GB004878

Yang Y., Yokokawa T., Motegi C. and Nagata T. (2014) Large-scale distribution of viruses in deep waters of the Pacific and Southern Oceans. Aquat Microb Ecol 71:193-202 (doi: 10.3354/ame01677)

Motegi C., Nagata T., Miki T., Weinbauer M.G., Legendre L. and Rassoulzadegan F. (2013) Interactive effects of viral and bacterial production on marine bacterial diversity. PLoS ONE 8(11): e76800. doi:10.1371/journal.pone.0076800

Weinbauer M.G., Liu J. Motegi C., Maier C., Pedrotti M.-L., Dai M. and Gattuso J.-P. (2013) Seasonal variability of microbial respiration and bacterial and archaeal community composition in the twilight zone. Aquat Microb Ecol 71: 99-115 (doi: 10.3354/ame01666)

Zhang R., Xia X., Lau S.C.K., Motegi C., Weinbauer M.G. and Jiao N. (2013) Response of bacterioplankton community structure to an artificial gradient of pCO2 in the Arctic Ocean. Biogeosciences 10: 3679–3689

Motegi C., Tanaka T., Piontek J., Brussaard C.P.D., Gattuso J.P. and Weinbauer M.G. (2013) Effect of CO2 enrichment on bacterial metabolism in an Arctic fjord. Biogeosciences 10: 3285–3296

Yokokawa T., Yang Y., Motegi C., and Nagata T. (2012) Large-scale geographical variation in prokaryotic abundance and production in meso- and bathypelagic zones of the central Pacific and Southern oceans Limnol Oceanogr 58: 61-73

Mari X., Rochelle-Newall E., Torréton J.P., Pringault O., Bettarel Y., Motegi C. and Weinbauer M.G. (2012) Production of individual marine organic aggregates using paramagnetic microspheres: A new tool for examining microbial associations with aggregates. Limnol Oceanogr Meth 10: 155-166

Migon C., Motegi C., Mari X., Dufour A. and Weinbauer M.G. (2011) Preliminary Study on Metal and Nutrient Concentrations in Running Water Systems in Southern New Caledonia. Bull Environ Contam Toxicol 87: 361–365

Yang Y., Motegi C., Yokokawa T. and Nagata T. (2010) Large scale distribution patterns of virioplankton in the upper ocean. Aquat Microb Ecol 60: 233-246

Weinbauer M.G., Kerros M.E., Motegi C., Wilhartitz I.C., Rassoulzadegan F., Torréton J.P. and Mari X. (2010) Bacterial community composition and potential controlling mechanisms along a trophic gradient in a barrier reef system. Aquat Microb Ecol 60:15-28

Motegi C. and Nagata T. (2009) Addition of monomeric and polymeric organic substrates alleviates viral lytic pressure on bacterial communities in coastal seawaters. Aquat Microb Ecol 57:343-350.

Weinbauer M.G., Bettarel T., Cattaneo R., Luef B., Maier C., Motegi C., Peduzzi P. and Mari X. (2009) Interactions of viruses and suspended matter in aquatic systems: avenues for further research. Aquat Microb Ecol 57:321-341.

Motegi C., Nagata T., Miki T., Weinbauer M.G., Legendre L. and Rassoulzadegan F. (2009) Viral control of bacterial growth efficiency in marine pelagic environments. Limnol Oceanogr 54:1901-1910.

Baki M.A., Motegi C., Shibata A., Fukuda H., Shimode S. and Kikuchi T. (2009) Temporal changes in chlorophyll a concentrations and bacterial, viral, and heterotrophic nanoflagellate abundances in the coastal zone of Sagami Bay, Japan: implications of top-down and bottom-up effects. Coast Mar Sci 33:29-38.

Motegi C. and Nagata T. (2007) Enhancement of viral production by addition of nitrogen or nitrogen plus carbon in subtropical surface waters of the South Pacific. Aquat Microb Ecol 48:27-34.

Book chapters:

Weinbauer M.G., Cattaneo R., Malits A., Motegi C., Gasol J.M., Herndl G.J., Mari X., Migon C., Rassoulzadegan F. (2012) In Black carbon and microorganisms in aquatic systems. Black Carbon: Sources, Regulation and Environmental Impact. Nova Science Publishers.

Nagata T. and Motegi C. (2007) Sea of Microbes - Role of microbial community in marine ecosystems in “Biological Diversity in Natural” edited by The Kyoto University Museum and Center for Ecological Research, Kyoto University, pp.273-295.